Intake choice for low end
Yeah, but all motors have a cam in them...lol.
But seriously, you can get countless cam grinds for different performance. I'm assuming all this does is basically mirror the performance curve of the factory cam...which seems to lack in the low end. The comments I've seen about the 1.7's are mostly from guys with 5.2's.
But seriously, you can get countless cam grinds for different performance. I'm assuming all this does is basically mirror the performance curve of the factory cam...which seems to lack in the low end. The comments I've seen about the 1.7's are mostly from guys with 5.2's.
I thought I had to blow start it lol.
Have you tried replacing the fastman with your stock TB>? I'm curious because the factory TB, being smaller, would have more low speed velocity and a stronger vacumn signal under acceleration.
Legend
Joined: Jul 2007
Posts: 7,843
Likes: 13
From: DFW, Texas
The 1.7 rockers multiply your lift which allows the cylinder to fill up with a bigger charge. Basically the valve goes deeper into the cylinder which allows more air and fuel to pass thru the valve opening.
The stock cam has a .432 lift on the intake and exhaust valves. The stock rocker ratio is 1.6 on the magnum engine. Divide .432 by 1.6 then multiply by the new 1.7 rocker ratio and your new lift becomes .459 at max open that's .027 inches more room to get air and fuel in at max lift. Also, when the lifter starts to travel up the cam's lobe, it pushes the valve open just a bit further across the cam lobes entire ground-in duration. Basically is amplifies the cam's lobe to make it taller, but not wider.
The stock cam has a .432 lift on the intake and exhaust valves. The stock rocker ratio is 1.6 on the magnum engine. Divide .432 by 1.6 then multiply by the new 1.7 rocker ratio and your new lift becomes .459 at max open that's .027 inches more room to get air and fuel in at max lift. Also, when the lifter starts to travel up the cam's lobe, it pushes the valve open just a bit further across the cam lobes entire ground-in duration. Basically is amplifies the cam's lobe to make it taller, but not wider.
The 1.7 rockers multiply your lift which allows the cylinder to fill up with a bigger charge. Basically the valve goes deeper into the cylinder which allows more air and fuel to pass thru the valve opening.
The stock cam has a .432 lift on the intake and exhaust valves. The stock rocker ratio is 1.6 on the magnum engine. Divide .432 by 1.6 then multiply by the new 1.7 rocker ratio and your new lift becomes .459 at max open that's .027 inches more room to get air and fuel in at max lift. Also, when the lifter starts to travel up the cam's lobe, it pushes the valve open just a bit further across the cam lobes entire ground-in duration. Basically is amplifies the cam's lobe to make it taller, but not wider.
The stock cam has a .432 lift on the intake and exhaust valves. The stock rocker ratio is 1.6 on the magnum engine. Divide .432 by 1.6 then multiply by the new 1.7 rocker ratio and your new lift becomes .459 at max open that's .027 inches more room to get air and fuel in at max lift. Also, when the lifter starts to travel up the cam's lobe, it pushes the valve open just a bit further across the cam lobes entire ground-in duration. Basically is amplifies the cam's lobe to make it taller, but not wider.
Captain
Joined: Oct 2007
Posts: 706
Likes: 0
From: Green Bay WI
The 1.7 rockers multiply your lift which allows the cylinder to fill up with a bigger charge. Basically the valve goes deeper into the cylinder which allows more air and fuel to pass thru the valve opening.
The stock cam has a .432 lift on the intake and exhaust valves. The stock rocker ratio is 1.6 on the magnum engine. Divide .432 by 1.6 then multiply by the new 1.7 rocker ratio and your new lift becomes .459 at max open that's .027 inches more room to get air and fuel in at max lift. Also, when the lifter starts to travel up the cam's lobe, it pushes the valve open just a bit further across the cam lobes entire ground-in duration. Basically is amplifies the cam's lobe to make it taller, but not wider.
The stock cam has a .432 lift on the intake and exhaust valves. The stock rocker ratio is 1.6 on the magnum engine. Divide .432 by 1.6 then multiply by the new 1.7 rocker ratio and your new lift becomes .459 at max open that's .027 inches more room to get air and fuel in at max lift. Also, when the lifter starts to travel up the cam's lobe, it pushes the valve open just a bit further across the cam lobes entire ground-in duration. Basically is amplifies the cam's lobe to make it taller, but not wider.
Record Breaker
Joined: Jan 2009
Posts: 2,087
Likes: 0
From: Indiana
to the OP, your driving a heavy, under powered truck, to get it to move, mash that throttle to the floor, and it'll go.
mine is a dog...when im towing anything over about 6500 lbs. Like i was pulling a 12000 lb wagon full of beans, felt like i was dragging a damn boat anchor.
mine is a dog...when im towing anything over about 6500 lbs. Like i was pulling a 12000 lb wagon full of beans, felt like i was dragging a damn boat anchor.
Record Breaker
Joined: Oct 2007
Posts: 1,680
Likes: 0
From: Allentown, PA
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